$\begin{array}{1 1} \text{(a) a more reactive metal displaces a less reactive metal from its compound.} \\ \text{(b) A less reactive metal displaces a more reactive metal from its compound} \\ \text{(c) Displacement only occurs when two of the same metals are reacted} \\ \text{
(d) Displacement reactions will only occur in metals above iron in the reactivity series}
\end{array} $
